Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Accepting Criticism

Criticism is a comment or judgment made to find fault in an idea. This can be bad for creativity, especially when it comes from a boss or a spouse. When someone produces a new idea, it is likely that they are already a little insecure about it. Criticism often feels like a personal attack. As a result, most people become defensive when criticized and will stubbornly defend their idea even if the criticism has merit.

Criticism has no place in a brainstorm [ For more on 'brainstorm' go here: http://www.braingle.com/mind/85.html ], but once you have selected an idea to pursue, it is a valuable tool. Accepting criticism and using it to improve your ideas are critical to producing quality solutions. Remember that the criticism is not about you; it is about the idea. Try to divorce yourself from your idea and pretend that it just fell out of the sky. This will help you look at it objectively and recognize if the criticism is valid.

Avoid being defensive. Instead, ask lots of clarifying questions and find out what changes the critic would make. Be sure to refer back to the goals so that you aren't solving problems that you do not need to solve. Once you fully understand what the critic is trying to say, you can decide if they have any validity.

A supportive environment that gives good criticism [ For more on 'good criticism' go here: http://www.braingle.com/mind/235.html ] and encourages wild ideas will help people become more comfortable with creativity.
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For more mind exercises: http://www.braingle.com/mind/